BAEL-5657 - Reading JSON from a URL in Java (#12584)
* moving SpringBootPersistenceApplication class to its own package * from com.baeldung to com.baeldung.logging to prevent it from loading contexts from other applications. * moving SpringBootPersistenceApplication class to its own package * from com.baeldung to com.baeldung.logging to prevent it from loading contexts from other applications. * Spring Data MongoDB - Configure Connection Ready for revision. * fixed tests to reflect article changes * BAEL-5657 * reverting BAEL-5657 * reverting BAEL-5657 * done * reverting bael-5366 * revert bael-5366 * revert bael-3366 * including section 3 3. Using commons-io and org.json * replacing tabs with spaces
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Ulisses Lima
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@ -32,6 +32,18 @@
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<artifactId>jackson-dataformat-csv</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>org.mock-server</groupId>
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<artifactId>mockserver-netty</artifactId>
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<version>${mockserver-netty.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>${json.version}</version>
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</dependency>
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</dependencies>
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<build>
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@ -44,4 +56,9 @@
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</resources>
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</build>
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<properties>
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<mockserver-netty.version>5.13.2</mockserver-netty.version>
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<json.version>20220320</json.version>
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</properties>
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</project>
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@ -0,0 +1,62 @@
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package com.baeldung.jackson.jsonurlreader;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.nio.charset.Charset;
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import org.apache.commons.io.IOUtils;
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import org.json.JSONObject;
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import com.fasterxml.jackson.core.exc.StreamReadException;
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import com.fasterxml.jackson.databind.DatabindException;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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public class JsonUrlReader {
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public static void main(String[] args) throws StreamReadException, DatabindException, MalformedURLException, IOException {
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String url = args[0];
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JsonNode node = JsonUrlReader.get(url);
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System.out.println(node.toPrettyString());
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}
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public static String stream(String url) throws IOException {
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try (InputStream input = new URL(url).openStream()) {
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InputStreamReader isr = new InputStreamReader(input, Charset.forName("UTF-8"));
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BufferedReader reader = new BufferedReader(isr);
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StringBuilder json = new StringBuilder();
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int c;
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while ((c = reader.read()) != -1) {
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json.append((char) c);
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}
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return json.toString();
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}
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}
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public static JsonNode get(String url) throws StreamReadException, DatabindException, MalformedURLException, IOException {
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ObjectMapper mapper = new ObjectMapper();
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JsonNode json = mapper.readTree(new URL(url));
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return json;
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}
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public static <T> T get(String url, Class<T> type) throws StreamReadException, DatabindException, MalformedURLException, IOException {
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ObjectMapper mapper = new ObjectMapper();
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T entity = mapper.readValue(new URL(url), type);
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return entity;
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}
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public static String getString(String url) throws StreamReadException, DatabindException, MalformedURLException, IOException {
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return get(url).toPrettyString();
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}
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public static JSONObject getJson(String url) throws MalformedURLException, IOException {
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String json = IOUtils.toString(new URL(url), Charset.forName("UTF-8"));
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JSONObject object = new JSONObject(json);
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return object;
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}
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}
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@ -0,0 +1,40 @@
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package com.baeldung.jackson.jsonurlreader.data;
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public class Example {
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private String name;
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private Integer n;
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private Boolean real;
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public Example() {
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}
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public Example(String name, Integer n, Boolean real) {
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this.name = name;
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this.n = n;
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this.real = real;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Integer getN() {
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return n;
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}
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public void setN(Integer n) {
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this.n = n;
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}
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public Boolean getReal() {
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return real;
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}
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public void setReal(Boolean real) {
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this.real = real;
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}
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}
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@ -0,0 +1,62 @@
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package com.baeldung.jackson.jsonurlreader;
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import static org.mockserver.integration.ClientAndServer.startClientAndServer;
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import static org.mockserver.model.HttpRequest.request;
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import static org.mockserver.model.HttpResponse.response;
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import java.io.IOException;
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import java.net.ServerSocket;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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import org.mockserver.client.MockServerClient;
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import org.mockserver.integration.ClientAndServer;
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import org.mockserver.model.HttpStatusCode;
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import com.baeldung.jackson.jsonurlreader.data.Example;
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public class JsonMockServer {
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protected static final String JSON_RESPONSE = "{ \"name\": \"A\", \"n\": 1, \"real\": true }";
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protected static final Example OBJECT_RESPONSE = new Example("A", 1, true);
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protected static String serviceUrl;
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private static final String SERVER_ADDRESS = "127.0.0.1";
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private static final String PATH = "/sample-json";
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private static ClientAndServer mockServer;
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private static int serverPort;
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@BeforeAll
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static void startServer() throws IOException {
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serverPort = getFreePort();
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serviceUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH;
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mockServer = startClientAndServer(serverPort);
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mockJsonRequest();
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}
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@AfterAll
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static void stopServer() {
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mockServer.stop();
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}
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@SuppressWarnings("resource")
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private static void mockJsonRequest() {
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new MockServerClient(SERVER_ADDRESS, serverPort)
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.when(request()
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.withPath(PATH)
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.withMethod("GET"))
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.respond(response()
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.withStatusCode(HttpStatusCode.OK_200.code())
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.withBody(JSON_RESPONSE)
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);
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}
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private static int getFreePort() throws IOException {
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try (ServerSocket serverSocket = new ServerSocket(0)) {
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return serverSocket.getLocalPort();
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}
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}
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}
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@ -0,0 +1,50 @@
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package com.baeldung.jackson.jsonurlreader;
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import static org.junit.Assert.assertEquals;
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import org.json.JSONObject;
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import org.junit.jupiter.api.Test;
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import com.baeldung.jackson.jsonurlreader.data.Example;
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import com.fasterxml.jackson.databind.JsonNode;
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public class JsonUrlReaderIntegrationTest extends JsonMockServer {
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@Test
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public void whenStreamUrl_thenJsonStringReturned() throws Exception {
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String jsonNode = JsonUrlReader.stream(serviceUrl);
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assertEquals(jsonNode, JSON_RESPONSE);
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}
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@Test
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public void whenGetUrl_thenJsonNodeReturned() throws Exception {
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JsonNode jsonNode = JsonUrlReader.get(serviceUrl);
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assertEquals(jsonNode.get("name")
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.textValue(), "A");
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assertEquals(jsonNode.get("n")
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.intValue(), 1);
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assertEquals(jsonNode.get("real")
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.booleanValue(), true);
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}
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@Test
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public void givenType_whenGetUrl_thenTypeReturned() throws Exception {
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Example object = JsonUrlReader.get(serviceUrl, Example.class);
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Integer n = 1;
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assertEquals(object.getName(), "A");
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assertEquals(object.getN(), n);
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assertEquals(object.getReal(), true);
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}
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@Test
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public void whenGetJsonUrl_thenJsonObjectReturned() throws Exception {
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JSONObject jsonObject = JsonUrlReader.getJson(serviceUrl);
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assertEquals(jsonObject.getString("name"), "A");
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assertEquals(jsonObject.getInt("n"), 1);
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assertEquals(jsonObject.getBoolean("real"), true);
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}
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}
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